Gigabyte GA - 686LX3 User manual

GA-686LX3
1
TABLE OF CONTENTS
1. INTRODUCTION.................................................................................. 1-1
1.1. PREFACE.............................................................................................................1-1
1.2. KEY FEATURES..................................................................................................1-1
1.3. PERFORMANCE LIST.........................................................................................1-2
1.4. BLOCK DIAGRAM ...............................................................................................1-3
1.5. INTRODUCE THE PentiumII Processor..........................................................1-4
1.6. What is AGP?.......................................................................................................1-6
2. SPECIFICATION ................................................................................. 2-1
2.1. HARDWARE........................................................................................................2-1
2.2. SOFTWARE.........................................................................................................2-2
2.3. ENVIRONMENT...................................................................................................2-2
3. HARDWARE INSTALLATION.............................................................. 3-1
3.1. UNPACKING........................................................................................................3-1
3.2. MAINBOARD LAYOUT........................................................................................3-2
3.3. QUICK REFERENCE FOR JUMPERS & CONNECTORS ................................3-3
3.4. DRAM INSTALLATION........................................................................................3-5
3.5. CPU SPEED SETUP ...........................................................................................3-5
3.6. CMOS RTC & ISA CFG CMOS SRAM................................................................3-6
3.7. SPEAKER CONNECTOR INSTALLATION ........................................................3-6
3.8. HARDWARE RESET SWITCH CONNECTOR INSTALLATION.......................3-6
3.9. POWER LED CONNECTOR INSTALLATION ...................................................3-6

Table of Contents
2
3.10. IDE & ATAPI DEVICE INSTALLATION.............................................................3-7
3.11. PERIPHERAL DEVICE INSTALLATION...........................................................3-7
3.12. KEYBOARD & PS/2 MOUSE INSTALLATION..................................................3-7
4. BIOS CONFIGURATION ..................................................................... 4-1
4.1. ENTERING SETUP .............................................................................................4-1
4.2. CONTROL KEYS.................................................................................................4-1
4.3. GETTING HELP...................................................................................................4-2
4.3.1. Main Menu................................................................................................4-2
4.3.2. Status Page Setup Menu / Option Page Setup Menu...............................4-2
4.4. THE MAIN MENU.................................................................................................4-2
4.5. STANDARD CMOS SETUP MENU ....................................................................4-4
4.6. BIOS FEATURES SETUP...................................................................................4-8
4.7. CHIPSET FEATURES SETUP............................................................................4-14
4.8. POWER MANAGEMENT SETUP.......................................................................4-17
4.9. PNP/PCI CONFIGURATION...............................................................................4-20
4.10. INTEGRATED PERIPHERALS .........................................................................4-23
4.11. LOAD SETUP DEFAULTS ................................................................................4-28
4.12. USER PASSWORD...........................................................................................4-29
4.13. IDE HDD AUTO DETECTION...........................................................................4-30
4.14. SAVE & EXIT SETUP........................................................................................4-29
4.15. EXIT WITHOUT SAVING..................................................................................4-32

GA-686LX3
1-1
1. INTRODUCTION
1.1. PREFACE
Welcome to use the GA–686LX3 motherboard. It is a PentiumII Processor
based PC / AT compatible system with AGP / PCI / ISA Bus, and has been
designed to be the fastest PC / AT system. There are some new features
allow you to operate the system with just the performance you want.
This manual also explains how to install the motherboard for operation, and
how to set up your CMOS CONFIGURATION with BIOS SETUP program.
1.2. KEY FEATURES
qIntel PentiumII Processor based PC / AT compatible mainboard.
qSlot 1 supports PentiumII processor running at 200-633 MHz.
qIntel 440LX chipset, Supports AGP / SDRAM / Ultra DMA/33 IDE /
Keyboard and PS/2 Mouse Power On / ACPI features.
qSupports 3xDIMMs using 3.3V EDO or SDRAM DIMM module.
qSupports 8 MB - 768 MB EDO / 384MB SDRAM memory on board.
qSupports ECC or Non-ECC type DRAM module.
q1xAGP slot, 4xPCI Bus slots, 3xISA Bus slots.
qSupports 2 channels Ultra DMA/33 IDE ports for 4 IDE Devices.
qSupports 2xCOM (16550), 1xLPT (EPP / ECP), 1x1.44MB Floppy port.
qSupports 2xUSB ports, 1xPS/2 Mouse.
qLicensed AWARD BIOS, 1Mbit FLASH RAM.
q30.5 cm x 18 cm ATX SIZE form factor, 4 layers PCB.

Introduction
1-2
1.3. PERFORMANCE LIST
The following performance data list is the testing results of some popular
benchmark testing programs.
These data are just referred by users, and there is no responsibility for
different testing data values gotten by users. (The different Hardware &
Software configuration will result in different benchmark testing results.)
•CPU PentiumII processor
•DRAM (32 x 2) MB SDRAM (LGS GM72V16821GT10K)
•CACHE SIZE 512 KB included in CPU
•DISPLAY GA-600 AGP Display Card (4MB SGRAM)
•STORAGE Onboard IDE (IBM DHEA-34330)
•O.S. Windows® 95 OSR2.1
•DRIVER Display Driver at 1024 x 768 x 64k colors x 75Hz.
Triones Bus Master IDE Driver 3.70
Intel PentiumII
Processor 266MHz 300MHz
Winbench97
CPU mark32 692 759
Business Disk 1940 2070
Hi-End Disk 5900 6210
Business Graphics 116 126
Hi-End Graphics 50.8 55.4
Winstone97Business 62.1 64.8
Hi-End 30.7 32.1

GA-686LX3
1-3
3.3V EDO/SDRAM
DIMM Sockets
Floppy Port
1.4. BLOCK DIAGRAM
66MHZ
24MHz
66M
14.318MHz
33MHz
33MHz
33MHz
66MHz
66MHz
Ultra DMA/33
IDE Ports
IDE Bus
PCI Bus
ISA Bus
AGP Bus
LPT Port
Keyboard
COM Ports
DRAM Bus
PS/2 Mouse
USB Bus
USB Ports
14.318MHz
48MHz
14.318MHz
I/O
CHIPSET
83977TF
66M
AGP
SLOT
Host Bus
PAC
82432LX
CHIPSET
PLL
52C64-25
PIIX4
82371AB
CHIPSET
PLL
52C64-06

Introduction
1-4
1.5. INTRODUCE THE Pentium

II Processor & AGP
Figure 1:Retention Mechanism & attach Mount
Figure 2:OEM PentiumII Processor

GA-686LX3
1-5
Figure 3:Heatsink / FAN & Heat sink support for OEM PentiumII Processor
Figure 4:Boxed PentiumII Processor & Heat sink support

Introduction
1-6
1.6 What is AGP ?
The Accelerated Graphics Port (AGP) is a new port on the Host-To-PCI
bridge device that supports an AGP port. The main purpose of the AGP port
is to provide fast access to system memory.
The AGP port can be used either as fast PCI port (32-bits at 66MHz vs. 32-
bits at 33MHz) or as an AGP port which supports 2x data-rate, a read queue,
and side band addressing. When the 2x-data rate is used, the port can
transmit data at 533MB/sec (66.6*2*4). The read-queue can be used to
pipeline reads –removing the effects of the reads-latency. Side band
addressing can be used to transmit the data address on a separate line in
order to speed up the transaction.

GA-686LX3
2-1
2. SPECIFICATION
2.1. HARDWARE
•CPU −PentiumII processor 200 –633 MHz.
−242 pins 66MHz slot1 on board.
•SPEED −66 MHz system speed.
−66 MHz AGP bus speed. (133MHz 2*mode)
−33 MHz PCI-Bus speed.
−8 MHz AT bus speed.
•DRAM MEMORY −3 banks 168 pins DIMM module sockets on board.
−Use 8 / 16 / 32 / 64 / 128 / 256 MB 60~70 ns DIMM
module DRAM.
−8 ~ 768 MB EDO/384 MB SDRAM.
−Supports 3.3V SDRAM / EDO type DRAM.
−Supports ECC or Non-ECC type DRAM.
•CACHE MEMORY −32 KB 1st cache memory included in CPU.
−256KB/512 KB 2nd cache in CPU.
−Supports DIB speed mode for L2 Cache.
•I/O BUS SLOTS −4 33MHz Master / Slave PCI-BUS.
−3 8MHz 16 bits ISA BUS.
−1 66MHz / 133MHz AGP bus.
•IDE PORTS −2 Ultra DMA/33 Bus Master IDE channels on
board.(Using IRQ14,15)
−Support Mode 3,4 IDE & ATAPI CD –ROM.
•I/O PORTS −Supports 2 16550 COM ports.
−Supports 1 EPP/ECP LPT port.
−Supports 1 1.44/2.88 MB Floppy port.
−Supports 2 USB ports.
−Supports PS/2 Mouse.

Specification
2-2
•GREEN FUNCTION −Suspend mode support.
−Green switch & ACPI LED support.
−IDE & Display power down support.
−Monitor all IRQ / DMA / Display / I/O events.
•BIOS −1M bits FLASH RAM.
−Supports Plug & Play, DMI, ACPI Function.
•DIMENSION −ATX Form Factor, 4 layers PCB.
2.2. SOFTWARE
•DRIVER −Bus Master IDE Driver.
−Suspend to HD utility.
•BIOS −Licensed AWARD BIOS.
−AT CMOS Setup, BIOS / Chipset Setup, Green
Setup, Hard Disk Utility included.
•O.S. −Operation with MS-DOS, Windows95,
WINDOWSNT, OS/2, NOVELL and SCO UNIX.
2.3. ENVIRONMENT
•Ambient Temp. −0°C to +50°C (Operating).
•Relative Hum. −0 to +85% (Operating).
•Altitude −0 to 10,000 feet (Operating).
•Vibration −0 to 1,000 Hz.
•Electricity −4.9 V to 5.2 V. (Max. 20A current at 5V.)

GA-686LX3
3-1
3. HARDWARE INSTALLATION
3.1. UNPACKING
The mainboard package should contain the following:
•The GA – 686LX3 mainboard.
•The Retention Mechanism & Attach Mount
•USER'S MANUAL for mainboard.
•Cable set for IDE, Floppy & I/O devices.
•Diskette or CD for Mainboard Utility.
The mainboard contains sensitive electric components, which can be easily
damaged by static electricity, so the mainboard should be left in its original
packing until it is installed.
Unpacking and installation should be done on a grounded anti-static mat.
The operator should be wearing an anti static wristband, grounded at the
same point as the anti-static mat.
Inspect the mainboard carton for obvious damage. Shipping and handling
may cause damage to your board. Be sure there are no shipping and
handling damages on the board before proceeding.
After opening the mainboard carton, extract the system board and place it
only on a grounded anti-static surface component side up. Again inspect the
board for damage. Press down on all of the socket IC's to make sure that
they are properly seated. Do this only on with the board placed on a firm flat
surface.
M DO NOT APPLY POWER TO THE BOARD IF IT HAS BEEN DAMAGED.

Hardware Installation
3-2
3.2. MAINBOARD LAYOUT0
GA-686LX3
PIIX4
INTEL
440LX
1 1
1
IDE1
IDE2
FLOPPY
DIMM1
DIMM2
DIMM3
JP2
JP3
JP4
BATT1
BIOS
J13
SW
4 3 2 1
ON
COMA COMB
LPT
USB
MOUSE
KB
KB Power On
Fan Power
Slot 1
SPK RST
PW Led
HD IR GN Soft Power
ATX Power
1
1
1
×Figure 3.1Ø

GA-686LX3
3-3
3.3. QUICK REFERENCE FOR JUMPERS & CONNECTORS
tI/O Ports Connector
CN1 USB port.
CN3 For Primary IDE port.
CN2 For Secondary IDE port.
J2 For PS/2 Keyboard port.
J2 For PS/2 Mouse port.
J3 For Floppy port
J4 For Serial port2 (COM B).
J5 For Serial port1 (COM A).
J7 For LPT port.
tGN : GN-SW
Pin No. Function
1CTRL-Signal
2GND
tHD : Hard Disk active LED (HD-LED)
Pin No. Function
1LED POWER (+)
2LED POWER (-)
tJ1 : CPU cooling FAN Power Connector
Pin No. Function
1GND.
2+12V
3SENSE
tJ13 : System After Ac Back
Pin No. Function
1Signal
2GND

Hardware Installation
3-4
tJP1 : Keyboard Power On Selection
Pin No. Function
1-2 Enabled Keyboard power on.
2-3 Disabled Keyboard power on.
tRST : RESET Switch
Pin No. Function
1RESET Input
2GND
tPWR : POWER ON LED ( PW-LED)
Pin No. Function
1LED POWER (+)
2NC
3GND
tSlot 1
For PentiumII processor installed
tSPK : SPEAKER Connector
Pin No. Function
1VCC
2NC.
3NC.
4Output
tSoft PWR : Soft Power Switch
Pin No. Function
1CTRL-Signal
2GND

GA-686LX3
3-5
3.4. DRAM INSTALLATION
The mainboard can be installed with 4 / 8 / 16 / 32 / 64 / 128 / 256 MB 168
pins DIMM module DRAM, and the DRAM speed must be 50 or 60 ns for
EDO & 67~100 MHz for SDRAM. The DRAM memory system on mainboard
consists of bank 0, 1 & bank 2.
Since 168 pins DIMM module is 64 bits width, using 1 PCS which can match
a 64 bits system. The total memory size is 8 MB ~ 768 MB EDO / 384MB
SDRAM. The DRAM installation position refer to Figure 3.1, and notice the
Pin 1 of DIMM module must match with the Pin 1 of DIMM socket. Insert the
DRAM DIMM module into the DIMM socket at Vertical angle. If there is a
wrong direction of Pin 1, the DRAM DIMM module couldn't be inserted into
socket completely.
3.5. CPU SPEED SETUP
The default system bus speed is 66.6MHz. The user can change the DIP
SWITCH (SW) selection to set up the CPU speed for 200 - 366MHz
processor. The CPU speed must match with the frequency RATIO. It will
cause system hanging up if the frequency RATIO is higher than CPU's.
DIP SWITCH (SW)
1 2 3 4
FREQ.
RATIO
EXT.CLK.
MHz
INT.CLK.
MHz CPU Type
ON OFF ON ON 366 200 PentiumII 200 MHz
OFF OFF ON ON 3.5 66 233 PentiumII 233 MHz
ON ON OFF ON 466 266 PentiumII 266 MHz
OFF ON OFF ON 4.5 66 300 PentiumII 300 MHz
ON OFF OFF ON 566 333 PentiumII 333 MHz
OFF OFF OFF ON 5.5 66 366 PentiumII 366 MHz
Main Clock JP4 JP3 JP2
66 MHz 1-2 1-2 1-2

Hardware Installation
3-6
M The CPU is a sensitive electric component and it can be easily
damaged by static electricity, so users must keep it away from
metal surface when the CPU is installed onto mainboard.
3.6. CMOS RTC & ISA CFG CMOS SRAM
The mainboard contains RTC & CMOS SRAM on board. They have a power
supply from external battery to keep the DATA inviolate & effective. The RTC
is a REAL-TIME CLOCK device, which provides the DATE & TIME to system.
The CMOS SRAM is used for keeping the information of system
configuration, so the system can automatically boot OS every time. Since
the lifetime of internal battery is 5 years, the user can change a new Battery
to replace old one when it has consumed.
MDanger of explosion if battery is incorrectly replaced.
MReplace only with the same or equivalent type recommended by the
manufacturer.
MDispose of used batteries according to the manufacturer’s instructions.
3.7. SPEAKER CONNECTOR INSTALLATION
There is a speaker in AT system for sound purpose. The 4 - Pins connector
SPK is used to connect speaker.
3.8. HARDWARE RESET SWITCH CONNECTOR INSTALLATION
The RESET switch on panel provides users with HARDWARE RESET
function. The system will do a cold start after the RESET switch is pushed
and released by user. The RESET switch is a 2 PINS connector and should
be installed to RST on mainboard.
3.9. POWER LED CONNECTOR INSTALLATION
System has power LED lamp on the panel of case. The power LED will light
on off or flash to indicate which step on the system. The connector should be
connected to PWR of mainboard in correct direction.

GA-686LX3
3-7
3.10. IDE & ATAPI DEVICE INSTALLATION
There are two-Enhanced PCI IDE ports (IDE1, IDE2) on board, which
following ATAPI standard SPEC. Any one IDE port can connected to two
ATAPI devices (IDE Hard Disk, CD-ROM & Tape Driver), so total four ATAPI
devices can exist in a system. The HD is the active LED port for ATAPI
devices.
3.11. PERIPHERAL DEVICE INSTALLATION
After the I/O device installation and jumpers setup, the mainboard can be
mounted into the case and fixed by screw. To complete the mainboard
installation, the peripheral device could be installed now. The basic system
needs a display interface card. If the PCI - Bus device is to be installed in the
system, any one of four PCI - Bus slots can be used.
3.12. KEYBOARD & PS/2 MOUSE INSTALLATION
The main board supports PS/2 Mouse (J2). The BIOS will auto detect
whether the PS/2 Mouse is installed or not & assign IRQ12 for PS/2 Mouse
port if it is installed. After installing the peripheral device, the user should
check everything again, and prepare to power-on the system.